/* -*- mOde: C; tab-width: 2; indent-tabs-mode: t; c-basic-offset: 2 -*- */

/* GStreamer .wav encoder

 * Copyright (C) <2002> Iain Holmes <iain@prettypeople.org>

 * Copyright (C) <2006> Tim-Philipp Müller <tim centricular net>

 *

 * This library is free software; you can redistribute it and/or

 * modify it under the terms of the GNU Library General Public

 * License as published by the Free Software Foundation; either

 * version 2 of the License, or (at your option) any later version.

 *

 * This library is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * Library General Public License for more details.

 *

 * You should have received a copy of the GNU Library General Public

 * License along with this library; if not, write to the

 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,

 * Boston, MA 02111-1307, USA.

 * 

 */

#ifdef HAVE_CONFIG_H

#include "config.h"

#endif

#include <string.h>

#include "gstwavenc.h"

#ifdef __SYMBIAN32__

#include<gst/gstinfo.h>

#endif

GST_DEBUG_CATEGORY_STATIC (wavenc_debug);

struct riff_struct

{

  guint8 id[4];                 /* RIFF */

  guint32 len;

  guint8 wav_id[4];             /* WAVE */

};

struct chunk_struct

{

  guint8 id[4];

  guint32 len;

};

struct common_struct

{

  guint16 wFormatTag;

  guint16 wChannels;

  guint32 dwSamplesPerSec;

  guint32 dwAvgBytesPerSec;

  guint16 wBlockAlign;

  guint16 wBitsPerSample;       /* Only for PCM */

};

struct wave_header

{

  struct riff_struct riff;

  struct chunk_struct format;

  struct common_struct common;

  struct chunk_struct data;

};

static const GstElementDetails gst_wavenc_details =

GST_ELEMENT_DETAILS ("WAV audio muxer",

    "Codec/Muxer/Audio",

    "Encode raw audio into WAV",

    "Iain Holmes <iain@prettypeople.org>");

/* FIXME: mono doesn't produce correct files it seems, at least mplayer xruns */

/* Max. of two channels, more channels need WAVFORMATEX with

 * channel layout, which we do not support yet */

#define SINK_CAPS \

    "audio/x-raw-int, "                  \

    "rate = (int) [ 1, MAX ], "          \

    "channels = (int) [ 1, 2 ], "        \

    "endianness = (int) LITTLE_ENDIAN, " \

    "width = (int) 16, "                 \

    "depth = (int) 16, "                 \

    "signed = (boolean) true"            \

    "; "                                 \

    "audio/x-raw-int, "                  \

    "rate = (int) [ 1, MAX ], "          \

    "channels = (int) [ 1, 2 ], "        \

    "width = (int) 8, "                  \

    "signed = (boolean) false"

static GstStaticPadTemplate sink_factory = GST_STATIC_PAD_TEMPLATE ("sink",

    GST_PAD_SINK,

    GST_PAD_ALWAYS,

    GST_STATIC_CAPS (SINK_CAPS)

    );

static GstStaticPadTemplate src_factory = GST_STATIC_PAD_TEMPLATE ("src",

    GST_PAD_SRC,

    GST_PAD_ALWAYS,

    GST_STATIC_CAPS ("audio/x-wav")

    );

GST_BOILERPLATE (GstWavEnc, gst_wavenc, GstElement, GST_TYPE_ELEMENT);

static GstFlowReturn gst_wavenc_chain (GstPad * pad, GstBuffer * buf);

static gboolean gst_wavenc_event (GstPad * pad, GstEvent * event);

static GstStateChangeReturn gst_wavenc_change_state (GstElement * element,

    GstStateChange transition);

static gboolean gst_wavenc_sink_setcaps (GstPad * pad, GstCaps * caps);

static void

gst_wavenc_base_init (gpointer g_class)

{

  GstElementClass *element_class = GST_ELEMENT_CLASS (g_class);

  gst_element_class_set_details (element_class, &gst_wavenc_details);

  gst_element_class_add_pad_template (element_class,

      gst_static_pad_template_get (&src_factory));

  gst_element_class_add_pad_template (element_class,

      gst_static_pad_template_get (&sink_factory));

  GST_DEBUG_CATEGORY_INIT (wavenc_debug, "wavenc", 0, "WAV encoder element");

}

static void

gst_wavenc_class_init (GstWavEncClass * klass)

{

  GstElementClass *element_class;

  element_class = (GstElementClass *) klass;

  element_class->change_state = GST_DEBUG_FUNCPTR (gst_wavenc_change_state);

}

static void

gst_wavenc_init (GstWavEnc * wavenc, GstWavEncClass * klass)

{

  wavenc->sinkpad = gst_pad_new_from_static_template (&sink_factory, "sink");

  gst_pad_set_chain_function (wavenc->sinkpad,

      GST_DEBUG_FUNCPTR (gst_wavenc_chain));

  gst_pad_set_event_function (wavenc->sinkpad,

      GST_DEBUG_FUNCPTR (gst_wavenc_event));

  gst_pad_set_setcaps_function (wavenc->sinkpad,

      GST_DEBUG_FUNCPTR (gst_wavenc_sink_setcaps));

  gst_element_add_pad (GST_ELEMENT (wavenc), wavenc->sinkpad);

  wavenc->srcpad = gst_pad_new_from_static_template (&src_factory, "src");

  gst_pad_use_fixed_caps (wavenc->srcpad);

  gst_pad_set_caps (wavenc->srcpad,

      gst_static_pad_template_get_caps (&src_factory));

  gst_element_add_pad (GST_ELEMENT (wavenc), wavenc->srcpad);

}

#define WAV_HEADER_LEN 44

static GstBuffer *

gst_wavenc_create_header_buf (GstWavEnc * wavenc, guint audio_data_size)

{

  struct wave_header wave;

  GstBuffer *buf;

  guint8 *header;

  buf = gst_buffer_new_and_alloc (WAV_HEADER_LEN);

  header = GST_BUFFER_DATA (buf);

  memset (header, 0, WAV_HEADER_LEN);

  wave.common.wChannels = wavenc->channels;

  wave.common.dwSamplesPerSec = wavenc->rate;

  /* Fill out our wav-header with some information */

  memcpy (wave.riff.id, "RIFF", 4);

  wave.riff.len = audio_data_size + WAV_HEADER_LEN - 8;

  memcpy (wave.riff.wav_id, "WAVE", 4);

  memcpy (wave.format.id, "fmt ", 4);

  wave.format.len = 16;

  wave.common.dwAvgBytesPerSec =

  memcpy (wave.data.id, "data", 4);

  wave.data.len = audio_data_size;

  memcpy (header, (char *) wave.riff.id, 4);

  GST_WRITE_UINT32_LE (header + 4, wave.riff.len);

  memcpy (header + 8, (char *) wave.riff.wav_id, 4);

  memcpy (header + 12, (char *) wave.format.id, 4);

  GST_WRITE_UINT32_LE (header + 16, wave.format.len);

  GST_WRITE_UINT16_LE (header + 20, wave.common.wFormatTag);

  GST_WRITE_UINT16_LE (header + 22, wave.common.wChannels);

  GST_WRITE_UINT32_LE (header + 24, wave.common.dwSamplesPerSec);

  GST_WRITE_UINT32_LE (header + 28, wave.common.dwAvgBytesPerSec);

  GST_WRITE_UINT16_LE (header + 32, wave.common.wBlockAlign);

  GST_WRITE_UINT16_LE (header + 34, wave.common.wBitsPerSample);

  memcpy (header + 36, (char *) wave.data.id, 4);

  GST_WRITE_UINT32_LE (header + 40, wave.data.len);

  gst_buffer_set_caps (buf, GST_PAD_CAPS (wavenc->srcpad));

  return buf;

}

static GstFlowReturn

gst_wavenc_push_header (GstWavEnc * wavenc, guint audio_data_size)

{

  GstFlowReturn ret;

  GstBuffer *outbuf;

  /* seek to beginning of file */

  gst_pad_push_event (wavenc->srcpad,

      gst_event_new_new_segment (FALSE, 1.0, GST_FORMAT_BYTES,

          0, GST_CLOCK_TIME_NONE, 0));

  GST_DEBUG_OBJECT (wavenc, "writing header with datasize=%u", audio_data_size);

  outbuf = gst_wavenc_create_header_buf (wavenc, audio_data_size);

  GST_BUFFER_OFFSET (outbuf) = 0;

  ret = gst_pad_push (wavenc->srcpad, outbuf);

  if (ret != GST_FLOW_OK) {

    GST_WARNING_OBJECT (wavenc, "push header failed: flow = %s",

        gst_flow_get_name (ret));

  }

  return ret;

}

static gboolean

gst_wavenc_sink_setcaps (GstPad * pad, GstCaps * caps)

{

  GstWavEnc *wavenc;

  GstStructure *structure;

  wavenc = GST_WAVENC (gst_pad_get_parent (pad));

  if (wavenc->sent_header) {

    GST_WARNING_OBJECT (wavenc, "cannot change format in middle of stream");

    goto fail;

  }

  GST_DEBUG_OBJECT (wavenc, "got caps: %" GST_PTR_FORMAT, caps);

  structure = gst_caps_get_structure (caps, 0);

  if (!gst_structure_get_int (structure, "channels", &chans) ||

    GST_WARNING_OBJECT (wavenc, "caps incomplete");

    goto fail;

  }

  wavenc->channels = chans;

  wavenc->rate = rate;

  gst_object_unref (wavenc);

  return TRUE;

fail:

  gst_object_unref (wavenc);

  return FALSE;

}

#if 0

static struct _maps

{

  const guint32 id;

  const gchar *name;

} maps[] = {

  {

  GST_RIFF_INFO_IARL, "Location"}, {

  GST_RIFF_INFO_IART, "Artist"}, {

  GST_RIFF_INFO_ICMS, "Commissioner"}, {

  GST_RIFF_INFO_ICMT, "Comment"}, {

  GST_RIFF_INFO_ICOP, "Copyright"}, {

  GST_RIFF_INFO_ICRD, "Creation Date"}, {

  GST_RIFF_INFO_IENG, "Engineer"}, {

  GST_RIFF_INFO_IGNR, "Genre"}, {

  GST_RIFF_INFO_IKEY, "Keywords"}, {

  GST_RIFF_INFO_INAM, "Title"}, {

  GST_RIFF_INFO_IPRD, "Product"}, {

  GST_RIFF_INFO_ISBJ, "Subject"}, {

  GST_RIFF_INFO_ISFT, "Software"}, {

  GST_RIFF_INFO_ITCH, "Technician"}

};

static guint32

get_id_from_name (const char *name)

{

  int i;

  for (i = 0; i < G_N_ELEMENTS (maps); i++) {

    if (strcasecmp (maps[i].name, name) == 0) {

      return maps[i].id;

    }

  }

  return 0;

}

static void

write_metadata (GstWavEnc * wavenc)

{

  GString *info_str;

  GList *props;

  int total = 4;

  gboolean need_to_write = FALSE;

  info_str = g_string_new ("LIST    INFO");

  for (props = wavenc->metadata->properties->properties; props;

      props = props->next) {

    GstPropsEntry *entry = props->data;

    const char *name;

    guint32 id;

    name = gst_props_entry_get_name (entry);

    id = get_id_from_name (name);

    if (id != 0) {

      const char *text;

      char *tmp;

      int len, req, i;

      need_to_write = TRUE;     /* We've got at least one entry */

      gst_props_entry_get_string (entry, &text);

      len = strlen (text) + 1;  /* The length in the file includes the \0 */

      tmp = g_strdup_printf ("%" GST_FOURCC_FORMAT "%d%s", GST_FOURCC_ARGS (id),

          GUINT32_TO_LE (len), text);

      g_string_append (info_str, tmp);

      g_free (tmp);

      /* Check that we end on an even boundary */

      req = ((len + 8) + 1) & ~1;

      for (i = 0; i < req - len; i++) {

        g_string_append_printf (info_str, "%c", 0);

      }

      total += req;

    }

  }

  if (need_to_write) {

    GstBuffer *buf;

    /* Now we've got all the strings together, we can write our length in */

    info_str->str[4] = GUINT32_TO_LE (total);

    buf = gst_buffer_new ();

    gst_buffer_set_data (buf, info_str->str, info_str->len);

    gst_pad_push (wavenc->srcpad, GST_DATA (buf));

    g_string_free (info_str, FALSE);

  }

}

static void

write_cues (GstWavEnc * wavenc)

{

  GString *cue_string, *point_string;

  GstBuffer *buf;

  GList *cue_list, *c;

  int num_cues, total = 4;

  if (gst_props_get (wavenc->metadata->properties,

          "cues", &cue_list, NULL) == FALSE) {

    /* No cues, move along please, nothing to see here */

    return;

  }

  /* Space for 'cue ', chunk size and number of cuepoints */

  cue_string = g_string_new ("cue         ");

#define CUEPOINT_SIZE 24

  point_string = g_string_sized_new (CUEPOINT_SIZE);

  for (c = cue_list, num_cues = 0; c; c = c->next, num_cues++) {

    GstCaps *cue_caps = c->data;

    guint32 pos;

    gst_props_get (cue_caps->properties, "position", &pos, NULL);

    point_string->str[0] = GUINT32_TO_LE (num_cues + 1);

    point_string->str[4] = GUINT32_TO_LE (0);

    /* Fixme: There is probably a macro for this */

    point_string->str[8] = 'd';

    point_string->str[9] = 'a';

    point_string->str[10] = 't';

    point_string->str[11] = 'a';

    point_string->str[12] = GUINT32_TO_LE (0);

    point_string->str[16] = GUINT32_TO_LE (0);

    point_string->str[20] = GUINT32_TO_LE (pos);

    total += CUEPOINT_SIZE;

  }

  /* Set the length and chunk size */

  cue_string->str[4] = GUINT32_TO_LE (total);

  cue_string->str[8] = GUINT32_TO_LE (num_cues);

  /* Stick the cue points on the end */

  g_string_append (cue_string, point_string->str);

  g_string_free (point_string, TRUE);

  buf = gst_buffer_new ();

  gst_buffer_set_data (buf, cue_string->str, cue_string->len);

  gst_pad_push (wavenc->srcpad, GST_DATA (buf));

  g_string_free (cue_string, FALSE);

}

static void

write_labels (GstWavEnc * wavenc)

{

  GstBuffer *buf;

  GString *info_str;

  int total = 4;

  GList *caps;

  info_str = g_string_new ("LIST    adtl");

  if (gst_props_get (wavenc->metadata->properties, "ltxts", &caps, NULL)) {

    GList *p;

    int i;

    for (p = caps, i = 1; p; p = p->next, i++) {

      GstCaps *ltxt_caps = p->data;

      GString *ltxt;

      char *label = NULL;

      int len, req, j;

      gst_props_get (ltxt_caps->properties, "name", &label, NULL);

      len = strlen (label);

#define LTXT_SIZE 28

      ltxt = g_string_new ("ltxt                        ");

      ltxt->str[8] = GUINT32_TO_LE (i); /* Identifier */

      ltxt->str[12] = GUINT32_TO_LE (0);        /* Sample Length */

      ltxt->str[16] = GUINT32_TO_LE (0);        /* FIXME: Don't save the purpose yet */

      ltxt->str[20] = GUINT16_TO_LE (0);        /* Country */

      ltxt->str[22] = GUINT16_TO_LE (0);        /* Language */

      ltxt->str[24] = GUINT16_TO_LE (0);        /* Dialect */

      ltxt->str[26] = GUINT16_TO_LE (0);        /* Code Page */

      g_string_append (ltxt, label);

      g_free (label);

      len += LTXT_SIZE;